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For area fragment resulted in partially reconfigurable field-programmable gate arrays that allow parts of the chip to be configured at run-time,a new method for fragment metric and online task placement based on the continuity of occupied (or free) space is proposed in this paper.Firstly,from the one-dimensional structure,the contribution of a cell sequence to the fragment metric F_S of a cell stream S is obtained,and then the one-dimensional fragment metric is obtained,which is independent of the size of the incoming tasks.Then,the result of fragment metric obtained through one-dimensional structure is extended to two-dimensional and high-dimensional structures.Finally,this fragment metric method is used during online placement of tasks on FPGAs to reduce chip fragments.The simulation results on two-dimensional FPGA show that,compared with the usual Bottom Left,First Fit and Best Fit placement strategies,the proposed fragment metric and placement method not only results in improvement in terms of waiting time,allocation time and response time,but also increases the chip utilization and reduces miss ratio.